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To go ape shit on, or attack, someone - all while screaming.

Only women can go banshee, as the phrase is based on the female spirit in Irish mythology that has a high-pitched scream/wail. Banshees are said to wail around a house if someone inside is about to die.

Originated in La Mesa, CA.
- "When I found some other bitch's underwear in Ben's closet, I totally went banshee on him."

- "Yeah, she didn't get the promotion. I'm kind of afraid she's gonna go banshee."
by Mo Sho July 06, 2009
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